The Fungicides of 1885. 29 



which were apparently attacked by the same peronospora that 

 is found upon potatoes. He believed he had cured or stopped 

 the disease. Since this fungus is closely related to the peronos- 

 pora of the vine, it seemed very probable that the remedy would 

 prove equally valuable for all similar diseases. Prillieux even 

 went so far as to advise, for the first time, the use of the mix- 

 ture upon potatoes and tomatoes, and events have shown that 

 his advice was well worthy of being followed. 



At the beginning of the year 1885 the general opinion ap- 

 pears to have been to wait until the appearance of the mildew 

 upon the vines before making an application ; and it was also 

 believed that one treatment was sufficient. But after the work 

 of the year Millardet thought 1 that in case of severe rains it 

 might be advisable to make a second. 



At the close of the year Prosper de Lafitte summed 2 up the 

 methods then in use for checking the downy mildew of the 

 grape, as follows : 



1. " The treatment of Beaune, which consists in covering the 

 posts and the tying material, rye straw being commonly used 

 for this purpose, with a five-tenths per cent solution of copper 

 sulphate. (Page 24.) 



2. " The treatment of which Millardet is the promoter " con- 

 sists in protecting the vines by means of a mixture of the milk 

 of lime and a solution of copper sulphate. (Page 27.) 



3. " Spraying the foliage with a simple solution of copper 

 sulphate. (Page 27.) 



4. " Spraying the foliage with the milk of lime, using approx- 

 imately a 2 per cent mixture." (Page 20.) 



To the above might have been added also : 



5. The treatment which consists in the application of pow- 

 ders. (Page 32.) 



The use of the " bouillie bordelaise " became more general in 

 1886 and many cases are reported in which its beneficial and 

 almost specific action was proved. The general opinion seemed 

 to be that it was superior to any of the other substances recom- 

 mended. 



In accordance with the advice given by Prillieux in the fall 

 of 1885 Jouet, in the Medoc, made what appears to have been 

 the first application of the mixture to potatoes for the preven- 



i Jour. &Ag. Prat. 1886, 734. 2 Ibid. 880 et seq. 



